drivers/pci/remove.c

   1 #include <linux/pci.h>
   2 #include <linux/module.h>
   3 #include <linux/pci-aspm.h>
   4 #include "pci.h"
   5
   6 static void pci_free_resources(struct pci_dev *dev)
   7 {
   8         int i;
   9
  10         msi_remove_pci_irq_vectors(dev);
  11
  12         pci_cleanup_rom(dev);
  13         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
  14                 struct resource *res = dev->resource + i;
  15                 if (res->parent)
  16                         release_resource(res);
  17         }
  18 }
  19
  20 static void pci_stop_dev(struct pci_dev *dev)
  21 {
  22         if (dev->is_added) {
  23                 pci_proc_detach_device(dev);
  24                 pci_remove_sysfs_dev_files(dev);
  25                 device_unregister(&dev->dev);
  26                 dev->is_added = 0;
  27         }
  28
  29         if (dev->bus->self)
  30                 pcie_aspm_exit_link_state(dev);
  31 }
  32
  33 static void pci_destroy_dev(struct pci_dev *dev)
  34 {
  35         /* Remove the device from the device lists, and prevent any further
  36          * list accesses from this device */
  37         down_write(&pci_bus_sem);
  38         list_del(&dev->bus_list);
  39         dev->bus_list.next = dev->bus_list.prev = NULL;
  40         up_write(&pci_bus_sem);
  41
  42         pci_free_resources(dev);
  43         pci_dev_put(dev);
  44 }
  45
  46 /**
  47  * pci_remove_device_safe - remove an unused hotplug device
  48  * @dev: the device to remove
  49  *
  50  * Delete the device structure from the device lists and
  51  * notify userspace (/sbin/hotplug), but only if the device
  52  * in question is not being used by a driver.
  53  * Returns 0 on success.
  54  */
  55 #if 0
  56 int pci_remove_device_safe(struct pci_dev *dev)
  57 {
  58         if (pci_dev_driver(dev))
  59                 return -EBUSY;
  60         pci_destroy_dev(dev);
  61         return 0;
  62 }
  63 #endif  /*  0  */
  64
  65 void pci_remove_bus(struct pci_bus *pci_bus)
  66 {
  67         pci_proc_detach_bus(pci_bus);
  68
  69         down_write(&pci_bus_sem);
  70         list_del(&pci_bus->node);
  71         pci_bus_release_busn_res(pci_bus);
  72         up_write(&pci_bus_sem);
  73         if (!pci_bus->is_added)
  74                 return;
  75
  76         pci_remove_legacy_files(pci_bus);
  77         device_unregister(&pci_bus->dev);
  78 }
  79 EXPORT_SYMBOL(pci_remove_bus);
  80
  81 static void __pci_remove_behind_bridge(struct pci_dev *dev);
  82 /**
  83  * pci_stop_and_remove_bus_device - remove a PCI device and any children
  84  * @dev: the device to remove
  85  *
  86  * Remove a PCI device from the device lists, informing the drivers
  87  * that the device has been removed.  We also remove any subordinate
  88  * buses and children in a depth-first manner.
  89  *
  90  * For each device we remove, delete the device structure from the
  91  * device lists, remove the /proc entry, and notify userspace
  92  * (/sbin/hotplug).
  93  */
  94 void __pci_remove_bus_device(struct pci_dev *dev)
  95 {
  96         if (dev->subordinate) {
  97                 struct pci_bus *b = dev->subordinate;
  98
  99                 __pci_remove_behind_bridge(dev);
 100                 pci_remove_bus(b);
 101                 dev->subordinate = NULL;
 102         }
 103
 104         pci_destroy_dev(dev);
 105 }
 106 EXPORT_SYMBOL(__pci_remove_bus_device);
 107
 108 void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 109 {
 110         pci_stop_bus_device(dev);
 111         __pci_remove_bus_device(dev);
 112 }
 113
 114 static void __pci_remove_behind_bridge(struct pci_dev *dev)
 115 {
 116         struct list_head *l, *n;
 117
 118         if (dev->subordinate)
 119                 list_for_each_safe(l, n, &dev->subordinate->devices)
 120                         __pci_remove_bus_device(pci_dev_b(l));
 121 }
 122
 123 static void pci_stop_behind_bridge(struct pci_dev *dev)
 124 {
 125         struct list_head *l, *n;
 126
 127         if (dev->subordinate)
 128                 list_for_each_safe(l, n, &dev->subordinate->devices)
 129                         pci_stop_bus_device(pci_dev_b(l));
 130 }
 131
 132 /**
 133  * pci_stop_and_remove_behind_bridge - stop and remove all devices behind
 134  *                                       a PCI bridge
 135  * @dev: PCI bridge device
 136  *
 137  * Remove all devices on the bus, except for the parent bridge.
 138  * This also removes any child buses, and any devices they may
 139  * contain in a depth-first manner.
 140  */
 141 void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
 142 {
 143         pci_stop_behind_bridge(dev);
 144         __pci_remove_behind_bridge(dev);
 145 }
 146
 147 static void pci_stop_bus_devices(struct pci_bus *bus)
 148 {
 149         struct list_head *l, *n;
 150
 151         /*
 152          * VFs could be removed by pci_stop_and_remove_bus_device() in the
 153          *  pci_stop_bus_devices() code path for PF.
 154          *  aka, bus->devices get updated in the process.
 155          * but VFs are inserted after PFs when SRIOV is enabled for PF,
 156          * We can iterate the list backwards to get prev valid PF instead
 157          *  of removed VF.
 158          */
 159         list_for_each_prev_safe(l, n, &bus->devices) {
 160                 struct pci_dev *dev = pci_dev_b(l);
 161                 pci_stop_bus_device(dev);
 162         }
 163 }
 164
 165 /**
 166  * pci_stop_bus_device - stop a PCI device and any children
 167  * @dev: the device to stop
 168  *
 169  * Stop a PCI device (detach the driver, remove from the global list
 170  * and so on). This also stop any subordinate buses and children in a
 171  * depth-first manner.
 172  */
 173 void pci_stop_bus_device(struct pci_dev *dev)
 174 {
 175         if (dev->subordinate)
 176                 pci_stop_bus_devices(dev->subordinate);
 177
 178         pci_stop_dev(dev);
 179 }
 180
 181 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
 182 EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
 183 EXPORT_SYMBOL_GPL(pci_stop_bus_device);